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関連する概念動画

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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Updated: Mar 20, 2026

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ウィルソン線を用いたブロッヒ状態トモグラフィー

Tracy Li1, Lucia Duca1, Martin Reitter1

  • 1Fakultät für Physik, Ludwig-Maximilians-Universität München, Schellingstrasse 4, 80799 Munich, Germany. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, 85748 Garching, Germany.

Science (New York, N.Y.)
|May 28, 2016
PubMed
まとめ
この要約は機械生成です。

電子帯構造の幾何学を直接観察するために ハネコブの格子の中の超冷たい原子を使用しました この方法はバンド固有状態とトポロジカルインヴァリアントを明らかにし,凝縮物質物理学を進める.

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科学分野:

  • 凝縮物質物理学
  • 量子情報科学
  • 原子物理学

背景:

  • トポロジーと幾何学は現代物理学の基礎であり,高エネルギー理論,量子情報,凝縮物質系に影響を与えています.
  • ウィルソン線で符号化された帯域固有状態の幾何学は,凝縮物質系における現象を支配する.

研究 の 目的:

  • 調節可能なシステムにおけるブロック帯の幾何学的な性質を実験的に探査し視覚化する.
  • バンド固有状態とトポロジカルインヴァリアントを完全に特徴づける方法を示す.

主な方法:

  • ミツバチの巣の光学格子に ルビジアム原子の超冷たいガスを利用する.
  • ウィルソン線で説明されるブロッヒ帯の内部に強い力のダイナミクスを実装する.
  • バンド群の進化を観察して バンド幾何学を推論する.

主要な成果:

  • バンド群の進化を通して,バンドの幾何学を直接観察する.
  • バンド固有状態とベリー曲線の決定に成功した.
  • シングルバンドとマルチバンドのチェーンとZ2番号を含むトポロジカルインヴァリアントの測定.

結論:

  • この実験技術は,凝縮物質系における帯状幾何学とトポロジーを探求するための強力なツールを提供します.
  • この研究は,帯状幾何学の理論的概念と実験的観測の間のギャップを埋めています.
  • 量子材料のトポロジック現象の理解を深める